The best explanation for why the keratin from a melanocyte is different from the keratin from a keratinocyte would be:
A. differences in the function of these two
types of cells.
B. differences in the cytoskeleton of these
two types of cells.
C. differences in the shape of these two types
of cells.
D. differences in the keratin genes in these
two types of cells.
D
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Place the following events in the order in which they occur when cells stop dividing at a G1 checkpoint after the cells have been irradiated.
1. Production of p21. 2. DNA damage. 3. Inactivation of cyclin-Cdk complex. 4. Activation of p53. 5. Activation of ATM/ATR A. 1-2-3-4-5 B. 2-5-4-1-3 C. 2-5-1-3-4 D. 5-4-3-2-1
A high concentration of H+ in the thylakoid compartment provides potential energy for the ____ by ____.
A. breakdown of water; oxidation B. production of ATP; ATP synthases C. reduction of NADP+; an electron transfer chain D. production of sugars; the light-independent reactions E. production of O2; photolysis
A glycoprotein
a. can be used as a receptor. b. can be used in enzymatic functions. c. is a type of peripheral protein. d. is a type of peripheral protein above that can be used as a receptor or in enzymatic functions.
For the complete respiration of one molecule of glucose, the citric acid cycle must turn a total of
What will be an ideal response?